Behold my evil Mewtwo creation, Chaos! Now Chaos has an interesting background story. There was a secret laboratory who had wanted to create a perfect Mewtwo, one who had no weaknesses to Dark or Ghost type Pokemon. So they combined DNA from Mewtwo and spliced it with DNA from various dark-type Pokemon, and they ended up with one nasty specimen of a Pokemon! And even though the original Mewtwo was already crazy-powerful, the scientists who created Chaos went and did some tinkering, and made Chaos even stronger! Not only is Chaos immune to dark-type attacks, he has an ability called 'Absolute Immunity', which means that he cannot be burned, poisoned, confused, paralysed, frozen, or put to sleep! Not only that, Chaos is able to use both dark-type and ghost-type attacks, which puts him at an advantage against other psychic Pokemon. Of course, a great power like Chaos the Mewtwo's cannot be controlled, so like the original Mewtwo before him, Chaos escaped from the lab that had brought him to life, and now he's free to bring chaos and destruction to the world!

Mewtwo (c) Nintendo

Chaos the Mewtwo (c) yodana